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Floor pans and a engine bay question
OK, this is going to be hard for an idiot like me to describe, but the engine bay in a 64 is both bigger, and the same size as a 63. As the shock towers are the same distance apart, they are the same width. The difference is in the lower portion of the shock tower, right about where the upper control arm bolts on. This is the narrowest point in the engine bay. In a 63 the center rib of the shock tower has a rounded contour, where the 64 is flattened. The flat shape is the same as in an early Mustang. The flattened center rib provides about 1/2" per side more clearance. On the d.s. this is where your header hits the s.t. This is why its easier to get headers for a 351w in a 64 than in a 63.
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